`region` has been deprecated in favor of `region_id`:
https://github.com/openstack/identity-api/blob/master/v3/src/markdown/identity-api-v3.md#endpoints-v3endpoints
`region` has been deprecated in favor of `region_id`:
https:/ /github. com/openstack/ identity- api/blob/ master/ v3/src/ markdown/ identity- api-v3. md#endpoints- v3endpoints